Off heat on boiling water, and stir in chocolate and butter until melted. Combine dry ingredients in another bowl. Mix on medium speed and gradually add the chocolate until fully blended. Then add eggs, sour cream and vanilla, and continue mixing.

Pour into a greased, floured 9-by-13-inch pan. Bake for 35 to 40 minutes at 350 degrees. Test for doneness with a toothpick (it’s done if it comes out dry). Cool and top with your favorite frosting.

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